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 vxdump(1M)                                                       vxdump(1M)

 NAME    [Toc]    [Back]
      vxdump, rvxdump - incremental VxFS file system dump, local or across

 SYNOPSIS    [Toc]    [Back]
      vxdump [-cnouwW] [-0123456789] [-b blocksize] [-B records] [-d density]
           [-f filename] [-s size] [-T time] filesystem

      rvxdump [-cnouwW] [-0123456789] [-b blocksize] [-B records] [-d
           density] [-f filename] [-s size] [-T time] filesystem

      vxdump option [argument ...] filesystem

      rvxdump option [argument ...] filesystem

 DESCRIPTION    [Toc]    [Back]
      vxdump copies to magnetic tape all files in the vxfs filesystem that
      have been changed after a certain date.  This information is derived
      from the files /etc/fstab and a timestamp file, by default
      /etc/dumpdates.  rvxdump copies the files to a tape drive on a remote
      system.  rvxdump runs a process, /usr/sbin/rmt, on the remote machine
      to access the tape device.

      vxdump and rvxdump support both getopt(3C) and traditional dump
      command line invocations as shown above.  The original dump command
      line style is supported for compatibility with previous versions of
      vxdump and for synonymy with the existing dump program used for hfs
      file systems.  For the traditional command line style, option consists
      of characters from the set 0123456789bBdfonsTuWw without any
      intervening white space.

      On most devices vxdump detects end-of-media and prompts you to change
      the media if there is insufficient space, so it is not necessary to
      specify the size of the device.  However, if the dump will require
      multiple tapes and the tapes are to be read using an older version of
      vxrestore, or if the tape device handles end-of-media in a way that
      vxdump doesn't recognize, then you must specify the size of the device
      using the -B option or a combination of the -d and -s options.

    Options    [Toc]    [Back]
      If no arguments are given, the options are assumed to be -9u and a
      default file system is dumped to the default tape.

      vxdump recognizes the following options:

           -number   number is a single digit in the range [0-9] and
                     indicates the dump level.  All files modified since the
                     last date stored in the timestamp file for the same
                     file system at a lesser dump level will be dumped.
                     Thus, the option -0 dumps the entire file system.  If
                     no date is determined by the level, the beginning of

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 vxdump(1M)                                                       vxdump(1M)

                     (UNIX) time is assumed.

           -B records
                     The number of logical records per volume.  The vxdump
                     logical record size is 1024 bytes.  records can also be
                     specified with a suffix to indicate a unit of measure
                     other than 1024 bytes.  You can append a k or K, m or
                     M, or g or G, to the number to indicate that the value
                     is in kilobytes, megabytes, or gigabytes, respectively.
                     This option overrides the calculation of tape size
                     based on length and density.

           -b blocksize
                     The blocking factor is taken from the blocksize option
                     argument.  (default is 63 if -b is not specified).
                     Block size is defined as the logical record size times
                     the blocking factor.  vxdump writes logical records of
                     1024 bytes.  Older versions of vxdump used a blocking
                     factor of 10 for tapes with densities less than 6250
                     BPI, and 32 for tapes with densities of 6250 BPI or
                     greater.  vxrestore dynamically determines the blocking

           -c        Cartridge.  Specifies using a cartridge instead of the
                     standard half-inch reel.  This sets the density to 1000
                     BPI and the blocking factor to 63.  The length is set
                     to 425 feet.  -c is incompatible with the -d option,
                     unless you specify a density of 1000 BPI with that

           -d density
                     The density of the tape (expressed in BPI) used to
                     calculate the amount of tape used per tape reel.  If -s
                     is specified, a default density value of 1600 is
                     assumed for a reel tape.

           -f filename
                     Place the dump on the file filename instead of the
                     tape.  If the name of the file is -(dash), vxdump
                     writes to the standard output.  This option can be of
                     the form machine:device to specify a tape device on a
                     remote machine.

           -n        Whenever vxdump requires operator attention, notify all
                     users in group operator by means similar to that
                     described by wall(1M).

           -o        Use /etc/vxdumpdates rather than /etc/dumpdates for
                     timestamp information.

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 vxdump(1M)                                                       vxdump(1M)

           -s size   size is the size of the dump tape, specified in feet.
                     When the specified size is reached, vxdump waits for
                     reels to be changed.  If -d is specified, a default
                     size value of 2300 is assumed for a reel tape.

           -T date   Use the specified date as the starting time for the
                     dump instead of the time determined from looking in the
                     timestamp file.  The format of date is the same as that
                     of ctime(3C) This option is useful for automated dump
                     scripts that wish to dump over a specific period of

                     +  You can specify -T only for incremental dumps; using
                        -T for a level 0 dump returns an error.

                     +  -T is mutually exclusive with the -u option.

                     +  If you enter an improperly formatted date, -T
                        returns an error message and terminates the dump.

           -u        If the dump completes successfully, write in the
                     timestamp file the date when the dump started.  This
                     file records a separate date for each file system and
                     each dump level.  The format of the timestamp file is
                     user-readable and consists of one free-format record
                     per line: file system name, increment level and dump
                     date in ctime(3C) format.  The timestamp file can be
                     edited to change any of the fields if necessary.  The
                     -u option is ignored for partial dumps.

           -W        For each file system in the timestamp file print the
                     most recent dump date and level, indicating which file
                     systems should be dumped.  If -W is specified, all
                     other options are ignored and vxdump exits immediately.

           -w        Operate like -W, but print only file systems that need
                     to be dumped.

    Operands    [Toc]    [Back]
      vxdump recognizes the following operand:

           filename  Name of the file that contains a list of all files in
                     the vxfs filesystem to be copied to magnetic tape.

    Operator Interaction    [Toc]    [Back]
      vxdump requires operator intervention for any of the following

           +  end of tape
           +  end of dump

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 vxdump(1M)                                                       vxdump(1M)

           +  tape-write error
           +  tape-open error
           +  disk-read error (if errors exceed threshold of 32).

      In addition to alerting all operators implied by the -n option, vxdump
      interacts with the control terminal operator by posing questions
      requiring yes or no answers when it can no longer proceed or if there
      is a serious problem.

      Because making a full dump typically requires considerable time,
      vxdump establishes a checkpoint at the start of each tape volume.  If,
      for any reason, writing that volume fails, vxdump, with operator
      permission, restarts from the checkpoint after the old tape is rewound
      and removed and a new tape is mounted.

      vxdump periodically reports information to the operator, including
      estimates (typically low) of the number of blocks to write, the number
      of tapes it requires, time required to complete, and the time
      remaining until tape change.  The output is verbose to inform other
      users that the terminal controlling vxdump is busy and will be for
      some time.

    Compatibility    [Toc]    [Back]
      The dump tape format is independent of the VxFS disk layout.  A dump
      of a file system with the Version 4 disk layout can be restored on a
      file system using the Version 2 disk layout or even a file system of
      another file system type, with the following exceptions:

      +  Files larger than 2 GB cannot be restored by earlier versions of
         vxrestore.  If a file larger than 2 GB is encountered, an older
         vxrestore skips the file and returns this message:

              Resync restore, skipped num blocks

      +  Files larger than 2 GB cannot be restored on a file system that
         does not support large files (see mount_vxfs(1M)).

      +  A file with a large uid (user ID of the file owner) or large gid
         (group ID of the file owner) cannot be restored correctly on a file
         system that does not support large IDs.  Instead, the owner and/or
         group of the file will be that of the user invoking vxrestore.  (A
         large ID is a value greater than 65535.  The VxFS Version 2 disk
         layout does not support large IDs).

      +  Files with VxFS extent attributes (see setext(1M)) cannot be
         restored on a file system of a type that does not support extent

      If you use vxdump to produce a dump intended for an earlier version of
      vxrestore, and if the dump requires multiple tapes, you should use the
      -s, -d, or -B option.

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 vxdump(1M)                                                       vxdump(1M)

      Dumps produced by older versions of vxdump can be read by the current
      version of vxrestore.

    Notes    [Toc]    [Back]
      Perform dumps with the file system unmounted or the system in singleuser
 environment (see init(1M)) to ensure a consistent dump.  If you
      have the HP OnLineJFS product installed, the dump can be performed in
      the multi-user environment using a snapshot file system with the
      online backup facility (see the snapof=file option of mount_vxfs(1M)).

      Up to 32 read errors on the file system are ignored.

      Each reel requires a new process; parent processes for reels already
      written remain until the entire tape is written.

      vxdump does not dump information about ACLs, therefore vxrestore does
      not restore information about ACLs.

      Neither vxdump nor vxrestore work with Storage Checkpoints.

      A version of vxdump resides in /sbin for use when the system is in
      single user state.

 EXAMPLES    [Toc]    [Back]
      In the following example, assume that the file system /mnt is normally
      attached to the file tree at the root directory, (/).

      In this example, the entire file system (/mnt) is dumped on
      /dev/rmt/0m and the size of the tape is 2 gigabytes.

           vxdump -0 -B 2g -f /dev/rmt/0m /mnt

      Using the traditional command line syntax and specifying the tape size
      in logical records:

           vxdump 0Bf 2097152 /dev/rmt/0m /mnt

      The option argument 2097152 goes with the option letter B as it is the
      first option letter that requires an option argument.  The option
      argument /dev/rmt/0m goes with the option letter f as it is the second
      option letter that requires an option argument.

 AUTHOR    [Toc]    [Back]
      vxdump and rvxdump are based on the dump and rdump programs from the
      4.4 Berkeley Software Distribution, developed by the the University of
      California, Berkeley, and its contributors.

 FILES    [Toc]    [Back]
      /dev/rmt/0m                   Default tape unit to dump to.
      /etc/dumpdates                New format-dump-date record.  This is
                                    the default file for VxFS.

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 vxdump(1M)                                                       vxdump(1M)

      /etc/vxdumpdates              New format-dump-date record.  Can be
                                    substituted for /etc/dumpdate by using
                                    the /CR -o option.
      /etc/fstab                    Dump table: file systems and frequency.
      /etc/mnttab                   Mounted file system table.
      /etc/group                    Used to find group operator.

 SEE ALSO    [Toc]    [Back]
      dump(1M), init(1M), mount(1M), mount_vxfs(1M), open(2), rmt(1M),
      setext(1M), vxrestore(1M), wall(1M), close(2), open(2), ctime(3C),
      getopt(3C), fstab(4), mnttab(4).

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[ Back ]
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